Effect

Generation I

Rage deals damage and it will not be possible for the user to do anything other than let the user continue to use Rage, and it will not stop using Rage until it faints or the battle ends. Every time the user is damaged by an attack or is targeted by Disable (only if Disable misses or fails), its rage will build, causing its Attack stat to increase by one stage. Being hit by a multi-hit move will raise the user's Attack once for each hit. Rage will use 1 PP when selected, but not use any PP on any subsequent turns.

If Rage misses during the turn it is selected, its secondary effects will not activate. If Rage misses due to the 99.6% accuracy bug of 100%-accuracy moves when there are no other accuracy or evasion modifiers in effect, or in case said modifiers cancel each other, its accuracy will be unaffected. However, if Rage misses due to an accuracy or evasion check when its decision-removing effect is active, the accuracy of Rage will subsequently become 0.4%. The duration of Rage will be paused but not disrupted by anything, including sleep, freeze, partial trapping, flinching, or if the user hurts itself due to confusion.

Rage will not attempt to increase the user's Attack if it has reached a stage of +6, and will not successfully increase the user's Attack if it has reached a value of 999.

In Stadium, Disable will cause a Pokémon's rage to build if it is successful.

Generation II

Rage is no longer a continuous move and will not automatically last until the end of the battle. When Rage is used consecutively, it will consume PP each turn, and the damage it deals is multiplied by a separate Rage counter; this Rage counter starts at 1 and increases by one each time the user of Rage is damaged by an attack, but is reset when the user ceases to use Rage (but not when Rage misses).

The accuracy-changing effects present in Generation I no longer apply, and missing does not change the accuracy of Rage.

Generation III

When Rage is used consecutively, the user's Attack stat now increases by one stage each time it is damaged by an attack instead. A Pokémon's rage will now build even if the initial use of Rage misses or fails.

It enrages you, which boosts your Attack every time you take damage from a move.*You'll get enraged, which boosts your Attack every time you take damage from a move. The boosted Attack returns to normal when you go to the next floor or step on a Wonder Tile.*

In the anime

Charmander's tail flame getting larger

Charmander

Cloyster

While this move is in use, it gains attack power each time the user is hit in battle.

Trivia

Prior to Generation VI, if the last opposing Pokémon successfully used Self-Destruct or Explosion on a target that had used Rage and the target survived, Rage would build despite it being the end of the battle.